What Frequency am I really on?

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wy3d
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Last seen: 2 years 6 months ago
Joined: 2010/10/16 - 21:01
What Frequency am I really on?

I have the TAPR HPSDR system with a GPS Disciplined 10 MHz reference oscillator. Using K1JT excellent FMT utilities I am very close to smack on frequency
Freq DF Meas Freq Resid Call
(MHz) (Hz) (MHz) (Hz)
------------------------------------------------
0.660 0.523 0.660000523 0.565 WPHY
0.620 -0.567 0.619999433 -0.525 WKHB
0.590 0.190 0.590000190 0.232 WKHB
1.210 -0.036 1.209999964 0.012 WPHT
3.330 -0.202 3.329999798 -0.132 CHU
5.000 -0.331 4.999999669 -0.244 WWV
7.850 0.021 7.850000021 0.138 CHU
10.000 -0.089 9.999999911 0.050 WWV
14.670 -0.524 14.669999476 -0.336 CHU
15.000 -0.196 14.999999804 -0.005 WWV
20.000 0.000 20.000000000 0.243 WWV

A: -0.04 Hz B: -0.0104 ppm StdDev: 0.320 Hz
err: 0.14 0.0147

So the question is, using WSPR 2.20 I show my TX frequency as 7.040135 but looking at the "activity" page wsprnet is showing me at 7.040152.

Now there are a few other stations which report me on my assumed frequency of 7.040135 leading me to think they are smack on as well. But when I read their transmit frequency and compare it against the "activity" page, I don't know what to expect.

Is there an error in the frequency posted to the "activity" page or is the TX frequency shown on the WSPR program not exact?

Any ideas or am I just missing something?

73 de Ron
wy3d